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Date:   Tue, 20 Oct 2020 11:24:32 +0530
From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     Sudeep Holla <sudeep.holla@arm.com>
Cc:     ulf.hansson@linaro.org, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Kevin Hilman <khilman@kernel.org>, Pavel Machek <pavel@ucw.cz>,
        Len Brown <len.brown@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
        Stephen Boyd <sboyd@kernel.org>, Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        linux-pm@vger.kernel.org,
        Vincent Guittot <vincent.guittot@linaro.org>, nks@flawful.org,
        georgi.djakov@linaro.org, Stephan Gerhold <stephan@gerhold.net>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org
Subject: Re: [PATCH V2 1/2] opp: Allow dev_pm_opp_get_opp_table() to return
 -EPROBE_DEFER
Message-ID: <20201020055431.ln7d57x76f7z6j5k@vireshk-i7>
References: <20201016042434.org6ibdqsqbzcdww@vireshk-i7>
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On 20-10-20, 10:35, Viresh Kumar wrote:
> On 19-10-20, 15:10, Sudeep Holla wrote:
> > On Mon, Oct 19, 2020 at 04:05:35PM +0530, Viresh Kumar wrote:
> > > On 19-10-20, 11:12, Sudeep Holla wrote:
> > > > Yes it has clocks property but used by SCMI(for CPUFreq/DevFreq) and not
> > > > by any clock provider driver. E.g. the issue you will see if "clocks"
> > > > property is used instead of "qcom,freq-domain" on Qcom parts.
> > > 
> > > Okay, I understand. But what I still don't understand is why it fails
> > > for you. You have a clocks property in DT for the CPU, the OPP core
> > > tries to get it and will get deferred-probed, which will try probing
> > > at a later point of time and it shall work then. Isn't it ?
> > >
> > 
> > Nope unfortunately. We don't have clock provider, so clk_get will
> > never succeed and always return -EPROBE_DEFER.
> 
> Now this is really bad, you have a fake clocks property, how is the
> OPP core supposed to know it ? Damn.

What about instead of fixing the OPP core, which really is doing the
right thing, we fix your driver (as you can't fix the DT) and add a
dummy CPU clk to make it all work ?

-- 
viresh